Environment.NewLine vs "\n"

[kmonahan]

The autograder tests fail for some learners if they use "\n" for new line instead of Environment.NewLine. Since learners previously learned "\n" for new line (and I don't think the textbook has gotten into the differences in line endings between systems), I suggest modifying the test to use "\n" instead. It's very confusing for all of us to see a test fail when the "Expected" and "Actual" output appear to be identical.